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Finding the Fourth Proportional to 8,128.80, 12,193.20 and 5,666.40

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Solution

The fourth proportional to 8,128.80, 12,193.20 and 5,666.40 is: 8,499.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,128.80 : 12,193.20 = 5,666.40 : x
  2. Step 2: Convert to fraction form
    8,128.80/12,193.20 = 5,666.40/x
  3. Step 3: Cross multiply
    8,128.80x = 12,193.20 × 5,666.40
  4. Step 4: Simplify right side
    8,128.80x = 69,091,548.48
  5. Step 5: Solve for x
    x = 69,091,548.48/8,128.80
  6. Step 6: Final answer
    x = 8,499.60

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.